[ˈsɪrəs], (Noun)

Definitions:
- cloud forming wispy filamentous tufted streaks or ‘mare's tails’ at high altitude (usually 5 to 13 km, 16,500 to 45,000 ft)
(e.g: long strands of high cirrus stretched across the eastern sky)

- a slender tendril or hairlike filament, such as the appendage of a barnacle, the barbel of a fish, or the intromittent organ of an earthworm


Phrases:

Origin:
early 18th century (in the sense ‘tendril’): from Latin, literally ‘a curl’